Indication of degraded transmit beam group in group-based reporting

ABSTRACT

Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for a UE to provide an indication when the quality of a group of previously-reported simultaneously receivable transmit beams has degraded to the point they are no longer simultaneously receivable.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims benefit of and priority to U.S. ProvisionalPatent Application Ser. No. 62/967,543, filed on Jan. 29, 2020, hereinincorporated by reference in its entirety as if fully set forth belowand for all applicable purposes.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure relate to wireless communications, andmore particularly, to techniques for processing transmissions withmultiple transmit beams.

DESCRIPTION OF RELATED ART

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,broadcasts, etc. These wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, etc.). Examples of such multiple-access systems include3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE)systems, LTE Advanced (LTE-A) systems, code division multiple access(CDMA) systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems, to name a few.

In some examples, a wireless multiple-access communication system mayinclude a number of base stations (BSs), which are each capable ofsimultaneously supporting communication for multiple communicationdevices, otherwise known as user equipments (UEs). In an LTE or LTE-Anetwork, a set of one or more base stations may define an eNodeB (eNB).In other examples (e.g., in a next generation, a new radio (NR), or 5Gnetwork), a wireless multiple access communication system may include anumber of distributed units (DUs) (e.g., edge units (EUs), edge nodes(ENs), radio heads (RHs), smart radio heads (SRHs), transmissionreception points (TRPs), etc.) in communication with a number of centralunits (CUs) (e.g., central nodes (CNs), access node controllers (ANCs),etc.), where a set of one or more DUs, in communication with a CU, maydefine an access node (e.g., which may be referred to as a BS, 5G NB,next generation NodeB (gNB or gNodeB), transmission reception point(TRP), etc.). A BS or DU may communicate with a set of UEs on downlinkchannels (e.g., for transmissions from a BS or DU to a UE) and uplinkchannels (e.g., for transmissions from a UE to BS or DU).

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. NR (e.g., new radio or 5G) is anexample of an emerging telecommunication standard. NR is a set ofenhancements to the LTE mobile standard promulgated by 3GPP. NR isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingOFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink(UL). To these ends, NR supports beamforming, multiple-inputmultiple-output (MIMO) antenna technology, and carrier aggregation.

However, as the demand for mobile broadband access continues toincrease, there exists a need for further improvements in NR and LTEtechnology. Preferably, these improvements should be applicable to othermulti-access technologies and the telecommunication standards thatemploy these technologies.

BRIEF SUMMARY

The systems, methods, and devices of the disclosure each have severalaspects, no single one of which is solely responsible for its desirableattributes. Without limiting the scope of this disclosure as expressedby the claims which follow, some features will now be discussed briefly.After considering this discussion, and particularly after reading thesection entitled “Detailed Description” one will understand how thefeatures of this disclosure provide advantages that include improvedcommunications between access points and stations in a wireless network.

Certain aspects provide a method for wireless communication by a userequipment (UE). The method generally includes reporting, to a networkentity, that a group of transmit beams is suitable for simultaneousreception by the UE, determining, after the reporting, that a qualitymetric has degraded such that the group of transmit beams is no longersuitable for simultaneous reception by the UE, and reporting, to thenetwork entity, that the group of transmit beams is no longer suitablefor simultaneous reception.

Certain aspects provide a method for wireless communication by a networkentity. The method generally includes receiving, from a user equipment(UE), reporting that a group of transmit beams is suitable forsimultaneous reception by the UE, and receiving from the UE, after thereporting, a report that a quality metric has degraded such that thegroup of transmit beams is no longer suitable for simultaneous receptionby the UE.

Certain aspects provide means for, apparatus, and/or computer readablemedium having computer executable code stored thereon, for techniquesdescribed herein for processing multi-TRP transmissions.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe appended drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the manner in which the above-recited features of the presentdisclosure can be understood in detail, a more particular description,briefly summarized above, may be had by reference to aspects, some ofwhich are illustrated in the drawings. It is to be noted, however, thatthe appended drawings illustrate only certain typical aspects of thisdisclosure and are therefore not to be considered limiting of its scope,for the description may admit to other equally effective aspects.

FIG. 1 is a block diagram conceptually illustrating an exampletelecommunications system, in accordance with certain aspects of thepresent disclosure.

FIG. 2 is a block diagram illustrating an example logical architectureof a distributed radio access network (RAN), in accordance with certainaspects of the present disclosure.

FIG. 3 is a diagram illustrating an example physical architecture of adistributed RAN, in accordance with certain aspects of the presentdisclosure.

FIG. 4 is a block diagram conceptually illustrating a design of anexample base station (BS) and user equipment (UE), in accordance withcertain aspects of the present disclosure.

FIG. 5 is a diagram showing examples for implementing a communicationprotocol stack, in accordance with certain aspects of the presentdisclosure.

FIG. 6 illustrates a diagram illustrating an example multipletransmission reception point (TRP) transmission scenario, in accordancewith certain aspects of the present disclosure.

FIG. 7 is a call flow diagram for beam measurement and reporting.

FIG. 8 is a flow diagram illustrating example operations that may beperformed by a UE, in accordance with certain aspects of the presentdisclosure.

FIG. 9 is a flow diagram illustrating example operations that may beperformed by a network entity, in accordance with certain aspects of thepresent disclosure.

FIG. 10 is a call flow diagram for beam measurement and reporting, inaccordance with certain aspects of the present disclosure.

To facilitate understanding, identical reference numerals have beenused, where possible, to designate identical elements that are common tothe figures. It is contemplated that elements disclosed in one aspectmay be beneficially utilized on other aspects without specificrecitation.

DETAILED DESCRIPTION

Aspects of the present disclosure provide apparatus, methods, processingsystems, and computer readable mediums for a UE to provide an indicationwhen the quality of a group of previously-reported simultaneouslyreceivable transmit beams has degraded to the point they are no longersimultaneously receivable.

The following description provides examples, and is not limiting of thescope, applicability, or examples set forth in the claims. Changes maybe made in the function and arrangement of elements discussed withoutdeparting from the scope of the disclosure. Various examples may omit,substitute, or add various procedures or components as appropriate. Forinstance, the methods described may be performed in an order differentfrom that described, and various steps may be added, omitted, orcombined. Also, features described with respect to some examples may becombined in some other examples. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition to,or other than, the various aspects of the disclosure set forth herein.It should be understood that any aspect of the disclosure disclosedherein may be embodied by one or more elements of a claim. The word“exemplary” is used herein to mean “serving as an example, instance, orillustration.” Any aspect described herein as “exemplary” is notnecessarily to be construed as preferred or advantageous over otheraspects.

The techniques described herein may be used for various wirelesscommunication technologies, such as LTE, CDMA, TDMA, FDMA, OFDMA,SC-FDMA and other networks. The terms “network” and “system” are oftenused interchangeably. A CDMA network may implement a radio technologysuch as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRAincludes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implementa radio technology such as Global System for Mobile Communications(GSM). An OFDMA network may implement a radio technology such as NR(e.g. 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRAand E-UTRA are part of Universal Mobile Telecommunication System (UMTS).

New Radio (NR) is an emerging wireless communications technology underdevelopment in conjunction with the 5G Technology Forum (SGTF). 3GPPLong Term Evolution (LTE) and LTE-Advanced (LTE-A) are releases of UMTSthat use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described indocuments from an organization named “3rd Generation PartnershipProject” (3GPP). cdma2000 and UMB are described in documents from anorganization named “3rd Generation Partnership Project 2” (3GPP2). Thetechniques described herein may be used for the wireless networks andradio technologies mentioned above as well as other wireless networksand radio technologies. For clarity, while aspects may be describedherein using terminology commonly associated with 3G and/or 4G wirelesstechnologies, aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

New radio (NR) access (e.g., 5G technology) may support various wirelesscommunication services, such as enhanced mobile broadband (eMBB)targeting wide bandwidth (e.g., 80 MHz or beyond), millimeter wave (mmW)targeting high carrier frequency (e.g., 25 GHz or beyond), massivemachine type communications MTC (mMTC) targeting non-backward compatibleMTC techniques, and/or mission critical targeting ultra-reliablelow-latency communications (URLLC). These services may include latencyand reliability requirements. These services may also have differenttransmission time intervals (TTI) to meet respective quality of service(QoS) requirements. In addition, these services may co-exist in the samesubframe.

Example Wireless Communications System

FIG. 1 illustrates an example wireless communication network 100 inwhich aspects of the present disclosure may be performed. For example,BSs 110 may perform operations 900 of FIG. 9 as part of a multipletransmission reception point (multi-TRP) session with a UE 120. In somecases, UE 120 may perform operations 800 of FIG. 8 to process PDSCHtransmissions received during the session.

As illustrated in FIG. 1, the wireless communication network 100 mayinclude a number of base stations (BSs) 110 and other network entities.A BS may be a station that communicates with user equipments (UEs). EachBS 110 may provide communication coverage for a particular geographicarea. In 3GPP, the term “cell” can refer to a coverage area of a Node B(NB) and/or a NB subsystem serving this coverage area, depending on thecontext in which the term is used. In NR systems, the term “cell” andnext generation NodeB (gNB or gNodeB), NR BS, 5G NB, access point (AP),or transmission reception point (TRP) may be interchangeable. In someexamples, a cell may not necessarily be stationary, and the geographicarea of the cell may move according to the location of a mobile BS. Insome examples, the base stations may be interconnected to one anotherand/or to one or more other base stations or network nodes (not shown)in wireless communication network 100 through various types of backhaulinterfaces, such as a direct physical connection, a wireless connection,a virtual network, or the like using any suitable transport network.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies. ARAT may also be referred to as a radio technology, an air interface,etc. A frequency may also be referred to as a carrier, a subcarrier, afrequency channel, a tone, a subband, etc. Each frequency may support asingle RAT in a given geographic area in order to avoid interferencebetween wireless networks of different RATs. In some cases, NR or 5G RATnetworks may be deployed.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or other types of cells. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having an association with the femto cell(e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in thehome, etc.). A BS for a macro cell may be referred to as a macro BS. ABS for a pico cell may be referred to as a pico BS. A BS for a femtocell may be referred to as a femto BS or a home BS. In the example shownin FIG. 1, the BSs 110 a, 110 b and 110 c may be macro BSs for the macrocells 102 a, 102 b and 102 c, respectively. The BS 110 x may be a picoBS for a pico cell 102 x. The BSs 110 y and 110 z may be femto BSs forthe femto cells 102 y and 102 z, respectively. ABS may support one ormultiple (e.g., three) cells.

Wireless communication network 100 may also include relay stations. Arelay station is a station that receives a transmission of data and/orother information from an upstream station (e.g., a BS or a UE) andsends a transmission of the data and/or other information to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that relays transmissions for other UEs. In the example shown in FIG.1, a relay station 110 r may communicate with the BS 110 a and a UE 120r in order to facilitate communication between the BS 110 a and the UE120 r. A relay station may also be referred to as a relay BS, a relay,etc.

Wireless communication network 100 may be a heterogeneous network thatincludes BSs of different types, e.g., macro BS, pico BS, femto BS,relays, etc. These different types of BSs may have different transmitpower levels, different coverage areas, and different impact oninterference in the wireless communication network 100. For example,macro BS may have a high transmit power level (e.g., 20 Watts) whereaspico BS, femto BS, and relays may have a lower transmit power level(e.g., 1 Watt).

Wireless communication network 100 may support synchronous orasynchronous operation. For synchronous operation, the BSs may havesimilar frame timing, and transmissions from different BSs may beapproximately aligned in time. For asynchronous operation, the BSs mayhave different frame timing, and transmissions from different BSs maynot be aligned in time. The techniques described herein may be used forboth synchronous and asynchronous operation.

A network controller 130 may couple to a set of BSs and providecoordination and control for these BSs. The network controller 130 maycommunicate with the BSs 110 via a backhaul. The BSs 110 may alsocommunicate with one another (e.g., directly or indirectly) via wirelessor wireline backhaul.

The UEs 120 (e.g., 120 x, 120 y, etc.) may be dispersed throughout thewireless communication network 100, and each UE may be stationary ormobile. A UE may also be referred to as a mobile station, a terminal, anaccess terminal, a subscriber unit, a station, a Customer PremisesEquipment (CPE), a cellular phone, a smart phone, a personal digitalassistant (PDA), a wireless modem, a wireless communication device, ahandheld device, a laptop computer, a cordless phone, a wireless localloop (WLL) station, a tablet computer, a camera, a gaming device, anetbook, a smartbook, an ultrabook, an appliance, a medical device ormedical equipment, a biometric sensor/device, a wearable device such asa smart watch, smart clothing, smart glasses, a smart wrist band, smartjewelry (e.g., a smart ring, a smart bracelet, etc.), an entertainmentdevice (e.g., a music device, a video device, a satellite radio, etc.),a vehicular component or sensor, a smart meter/sensor, industrialmanufacturing equipment, a global positioning system device, or anyother suitable device that is configured to communicate via a wirelessor wired medium. Some UEs may be considered machine-type communication(MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include,for example, robots, drones, remote devices, sensors, meters, monitors,location tags, etc., that may communicate with a BS, another device(e.g., remote device), or some other entity. A wireless node mayprovide, for example, connectivity for or to a network (e.g., a widearea network such as Internet or a cellular network) via a wired orwireless communication link. Some UEs may be consideredInternet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT)devices.

Certain wireless networks (e.g., LTE) utilize orthogonal frequencydivision multiplexing (OFDM) on the downlink and single-carrierfrequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDMpartition the system bandwidth into multiple (K) orthogonal subcarriers,which are also commonly referred to as tones, bins, etc. Each subcarriermay be modulated with data. In general, modulation symbols are sent inthe frequency domain with OFDM and in the time domain with SC-FDM. Thespacing between adjacent subcarriers may be fixed, and the total numberof subcarriers (K) may be dependent on the system bandwidth. Forexample, the spacing of the subcarriers may be 15 kHz and the minimumresource allocation (called a “resource block” (RB)) may be 12subcarriers (or 180 kHz). Consequently, the nominal Fast FourierTransfer (FFT) size may be equal to 128, 256, 512, 1024 or 2048 forsystem bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz),respectively. The system bandwidth may also be partitioned intosubbands. For example, a subband may cover 1.08 MHz (i.e., 6 resourceblocks), and there may be 1, 2, 4, 8, or 16 subbands for systembandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.

While aspects of the examples described herein may be associated withLTE technologies, aspects of the present disclosure may be applicablewith other wireless communications systems, such as NR. NR may utilizeOFDM with a CP on the uplink and downlink and include support forhalf-duplex operation using TDD. Beamforming may be supported and beamdirection may be dynamically configured. MIMO transmissions withprecoding may also be supported. MIMO configurations in the DL maysupport up to 8 transmit antennas with multi-layer DL transmissions upto 8 streams and up to 2 streams per UE. Multi-layer transmissions withup to 2 streams per UE may be supported. Aggregation of multiple cellsmay be supported with up to 8 serving cells.

In some examples, access to the air interface may be scheduled. Ascheduling entity (e.g., a BS) allocates resources for communicationamong some or all devices and equipment within its service area or cell.The scheduling entity may be responsible for scheduling, assigning,reconfiguring, and releasing resources for one or more subordinateentities. That is, for scheduled communication, subordinate entitiesutilize resources allocated by the scheduling entity. Base stations arenot the only entities that may function as a scheduling entity. In someexamples, a UE may function as a scheduling entity and may scheduleresources for one or more subordinate entities (e.g., one or more otherUEs), and the other UEs may utilize the resources scheduled by the UEfor wireless communication. In some examples, a UE may function as ascheduling entity in a peer-to-peer (P2P) network, and/or in a meshnetwork. In a mesh network example, UEs may communicate directly withone another in addition to communicating with a scheduling entity.

In FIG. 1, a solid line with double arrows indicates desiredtransmissions between a UE and a serving BS, which is a BS designated toserve the UE on the downlink and/or uplink. A finely dashed line withdouble arrows indicates interfering transmissions between a UE and a BS.

FIG. 2 illustrates an example logical architecture of a distributedRadio Access Network (RAN) 200, which may be implemented in the wirelesscommunication network 100 illustrated in FIG. 1. A 5G access node 206may include an access node controller (ANC) 202. ANC 202 may be acentral unit (CU) of the distributed RAN 200. The backhaul interface tothe Next Generation Core Network (NG-CN) 204 may terminate at ANC 202.The backhaul interface to neighboring next generation access Nodes(NG-ANs) 210 may terminate at ANC 202. ANC 202 may include one or moreTRPs 208 (e.g., cells, BSs, gNBs, etc.).

The TRPs 208 may be a distributed unit (DU). TRPs 208 may be connectedto a single ANC (e.g., ANC 202) or more than one ANC (not illustrated).For example, for RAN sharing, radio as a service (RaaS), and servicespecific AND deployments, TRPs 208 may be connected to more than oneANC. TRPs 208 may each include one or more antenna ports. TRPs 208 maybe configured to individually (e.g., dynamic selection) or jointly(e.g., joint transmission) serve traffic to a UE.

The logical architecture of distributed RAN 200 may support fronthaulingsolutions across different deployment types. For example, the logicalarchitecture may be based on transmit network capabilities (e.g.,bandwidth, latency, and/or jitter).

The logical architecture of distributed RAN 200 may share featuresand/or components with LTE. For example, next generation access node(NG-AN) 210 may support dual connectivity with NR and may share a commonfronthaul for LTE and NR.

The logical architecture of distributed RAN 200 may enable cooperationbetween and among TRPs 208, for example, within a TRP and/or across TRPsvia ANC 202. An inter-TRP interface may not be used.

Logical functions may be dynamically distributed in the logicalarchitecture of distributed RAN 200. As will be described in more detailwith reference to FIG. 5, the Radio Resource Control (RRC) layer, PacketData Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer,Medium Access Control (MAC) layer, and a Physical (PHY) layers may beadaptably placed at the DU (e.g., TRP 208) or CU (e.g., ANC 202).

FIG. 3 illustrates an example physical architecture of a distributed RAN300, according to aspects of the present disclosure. A centralized corenetwork unit (C-CU) 302 may host core network functions. C-CU 302 may becentrally deployed. C-CU 302 functionality may be offloaded (e.g., toadvanced wireless services (AWS)), in an effort to handle peak capacity.

A centralized RAN unit (C-RU) 304 may host one or more ANC functions.Optionally, the C-RU 304 may host core network functions locally. TheC-RU 304 may have distributed deployment. The C-RU 304 may be close tothe network edge.

A DU 306 may host one or more TRPs (Edge Node (EN), an Edge Unit (EU), aRadio Head (RH), a Smart Radio Head (SRH), or the like). The DU may belocated at edges of the network with radio frequency (RF) functionality.

FIG. 4 illustrates example components of BS 110 and UE 120 (as depictedin FIG. 1), which may be used to implement aspects of the presentdisclosure. For example, antennas 452, processors 466, 458, 464, and/orcontroller/processor 480 of the UE 120 may perform (or be used toperform) operations 800 of FIG. 8. Similarly, antennas 434, processors420, 430, 438, and/or controller/processor 440 of the BS 110 may perform(or be used to perform) operations 900 of FIG. 9.

At the BS 110, a transmit processor 420 may receive data from a datasource 412 and control information from a controller/processor 440. Thecontrol information may be for the physical broadcast channel (PBCH),physical control format indicator channel (PCFICH), physical hybrid ARQindicator channel (PHICH), physical downlink control channel (PDCCH),group common PDCCH (GC PDCCH), etc. The data may be for the physicaldownlink shared channel (PDSCH), etc. The processor 420 may process(e.g., encode and symbol map) the data and control information to obtaindata symbols and control symbols, respectively. The processor 420 mayalso generate reference symbols, e.g., for the primary synchronizationsignal (PSS), secondary synchronization signal (SSS), and cell-specificreference signal (CRS). A transmit (TX) multiple-input multiple-output(MIMO) processor 430 may perform spatial processing (e.g., precoding) onthe data symbols, the control symbols, and/or the reference symbols, ifapplicable, and may provide output symbol streams to the modulators(MODs) 432 a through 432 t. Each modulator 432 may process a respectiveoutput symbol stream (e.g., for OFDM, etc.) to obtain an output samplestream. Each modulator may further process (e.g., convert to analog,amplify, filter, and upconvert) the output sample stream to obtain adownlink signal. Downlink signals from modulators 432 a through 432 tmay be transmitted via the antennas 434 a through 434 t, respectively.

At the UE 120, the antennas 452 a through 452 r may receive the downlinksignals from the base station 110 and may provide received signals tothe demodulators (DEMODs) in transceivers 454 a through 454 r,respectively. Each demodulator 454 may condition (e.g., filter, amplify,downconvert, and digitize) a respective received signal to obtain inputsamples. Each demodulator may further process the input samples (e.g.,for OFDM, etc.) to obtain received symbols. A MIMO detector 456 mayobtain received symbols from all the demodulators 454 a through 454 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 458 may process (e.g.,demodulate, deinterleave, and decode) the detected symbols, providedecoded data for the UE 120 to a data sink 460, and provide decodedcontrol information to a controller/processor 480.

On the uplink, at UE 120, a transmit processor 464 may receive andprocess data (e.g., for the physical uplink shared channel (PUSCH)) froma data source 462 and control information (e.g., for the physical uplinkcontrol channel (PUCCH) from the controller/processor 480. The transmitprocessor 464 may also generate reference symbols for a reference signal(e.g., for the sounding reference signal (SRS)). The symbols from thetransmit processor 464 may be precoded by a TX MIMO processor 466 ifapplicable, further processed by the demodulators in transceivers 454 athrough 454 r (e.g., for SC-FDM, etc.), and transmitted to the basestation 110. At the BS 110, the uplink signals from the UE 120 may bereceived by the antennas 434, processed by the modulators 432, detectedby a MIMO detector 436 if applicable, and further processed by a receiveprocessor 438 to obtain decoded data and control information sent by theUE 120. The receive processor 438 may provide the decoded data to a datasink 439 and the decoded control information to the controller/processor440.

The controllers/processors 440 and 480 may direct the operation at theBS 110 and the UE 120, respectively. The processor 440 and/or otherprocessors and modules at the BS 110 may perform or direct the executionof processes for the techniques described herein. The memories 442 and482 may store data and program codes for BS 110 and UE 120,respectively. A scheduler 444 may schedule UEs for data transmission onthe downlink and/or uplink.

In LTE, the basic transmission time interval (TTI) or packet duration isthe 1 ms subframe. In NR, a subframe is still 1 ms, but the basic TTI isreferred to as a slot. A subframe contains a variable number of slots(e.g., 1, 2, 4, 8, 16, . . . slots) depending on the subcarrier spacing.The NR RB is 12 consecutive frequency subcarriers. NR may support a basesubcarrier spacing of 15 KHz and other subcarrier spacing may be definedwith respect to the base subcarrier spacing, for example, 30 kHz, 60kHz, 120 kHz, 240 kHz, etc. The symbol and slot lengths scale with thesubcarrier spacing. The CP length also depends on the subcarrierspacing.

FIG. 5 is a diagram showing an example of a frame format 500 for NR. Thetransmission timeline for each of the downlink and uplink may bepartitioned into units of radio frames. Each radio frame may have apredetermined duration (e.g., 10 ms) and may be partitioned into 10subframes, each of 1 ms, with indices of 0 through 9. Each subframe mayinclude a variable number of slots depending on the subcarrier spacing.Each slot may include a variable number of symbol periods (e.g., 7 or 14symbols) depending on the subcarrier spacing. The symbol periods in eachslot may be assigned indices. A mini-slot, which may be referred to as asub-slot structure, refers to a transmit time interval having a durationless than a slot (e.g., 2, 3, or 4 symbols).

Each symbol in a slot may indicate a link direction (e.g., DL, UL, orflexible) for data transmission and the link direction for each subframemay be dynamically switched. The link directions may be based on theslot format. Each slot may include DL/UL data as well as DL/UL controlinformation.

In NR, a synchronization signal (SS) block is transmitted. The SS blockincludes a PSS, a SSS, and a two symbol PBCH. The SS block can betransmitted in a fixed slot location, such as the symbols 0-3 as shownin FIG. 5. The PSS and SSS may be used by UEs for cell search andacquisition. The PSS may provide half-frame timing, the SS may providethe CP length and frame timing. The PSS and SSS may provide the cellidentity. The PBCH carries some basic system information, such asdownlink system bandwidth, timing information within radio frame, SSburst set periodicity, system frame number, etc. The SS blocks may beorganized into SS bursts to support beam sweeping. Further systeminformation such as, remaining minimum system information (RMSI), systeminformation blocks (SIBs), other system information (OSI) can betransmitted on a physical downlink shared channel (PDSCH) in certainsubframes. The SS block can be transmitted up to sixty-four times, forexample, with up to sixty-four different beam directions for mmW. The upto sixty-four transmissions of the SS block are referred to as the SSburst set. SS blocks in an SS burst set are transmitted in the samefrequency region, while SS blocks in different SS bursts sets can betransmitted at different frequency locations.

In some circumstances, two or more subordinate entities (e.g., UEs) maycommunicate with each other using sidelink signals. Real-worldapplications of such sidelink communications may include public safety,proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V)communications, Internet of Everything (IoE) communications, IoTcommunications, mission-critical mesh, and/or various other suitableapplications. Generally, a sidelink signal may refer to a signalcommunicated from one subordinate entity (e.g., UE1) to anothersubordinate entity (e.g., UE2) without relaying that communicationthrough the scheduling entity (e.g., UE or BS), even though thescheduling entity may be utilized for scheduling and/or controlpurposes. In some examples, the sidelink signals may be communicatedusing a licensed spectrum (unlike wireless local area networks, whichtypically use an unlicensed spectrum).

A UE may operate in various radio resource configurations, including aconfiguration associated with transmitting pilots using a dedicated setof resources (e.g., a radio resource control (RRC) dedicated state,etc.) or a configuration associated with transmitting pilots using acommon set of resources (e.g., an RRC common state, etc.). Whenoperating in the RRC dedicated state, the UE may select a dedicated setof resources for transmitting a pilot signal to a network. Whenoperating in the RRC common state, the UE may select a common set ofresources for transmitting a pilot signal to the network. In eithercase, a pilot signal transmitted by the UE may be received by one ormore network access devices, such as an AN, or a DU, or portionsthereof. Each receiving network access device may be configured toreceive and measure pilot signals transmitted on the common set ofresources, and also receive and measure pilot signals transmitted ondedicated sets of resources allocated to the UEs for which the networkaccess device is a member of a monitoring set of network access devicesfor the UE. One or more of the receiving network access devices, or a CUto which receiving network access device(s) transmit the measurements ofthe pilot signals, may use the measurements to identify serving cellsfor the UEs, or to initiate a change of serving cell for one or more ofthe UEs.

Example Multi-TRP Scenarios

NR networks are expected to utilize multiple transmission and receptionpoints (TRPs) to improve reliability and capacity performance throughflexible deployment scenarios. For example, allowing UEs to accesswireless networks via multi-TRPs may help support increased mobile datatraffic and enhance the coverage. Multi-TRPs may be used to implementone or more macro-cells, small cells, pico-cells, or femto-cells, andmay include remote radio heads, relay nodes, and the like. FIG. 6illustrates an example multi-TRP scenario, in which two TRPs (TRP 1 andTRP 2) serve a UE.

As illustrated in FIG. 6, for multi-TRP transmission, multiple PDCCHs(each transmitted from a different one of the multiple TRPs) may be usedfor scheduling. Each PDCCH may include corresponding downlink controlinformation (DCI).

For example, PDCCH1 (transmitted from TRP 1) may carry a first DCI thatschedules a first codeword (CW1) to be transmitted from TRP1 in PDSCH1.Similarly, PDCCH2 (transmitted from TRP2) may carry a second DCI thatschedules a second codeword (CW2) to be transmitted from TRP2 in PDSCH2.

For monitoring the DCIs transmitted from different TRPs, a number ofdifferent control resource sets (CORESETs) may be used. As used herein,the term CORESET generally refers to a set of physical resources (e.g.,a specific area on the NR Downlink Resource Grid) and a set ofparameters that is used to carry PDCCH/DCI. For example, a CORESET mayby similar in area to an LTE PDCCH area (e.g., the first 1, 2, 3, 4 OFDMsymbols in a subframe).

In some cases, TRP differentiation at the UE side may be based onCORESET groups. CORESET groups may be defined by higher layer signalingof an index per CORESET which can be used to group the CORESETs. Forexample, for 2 CORESET groups, two indexes may be used (i.e. index=0 andindex=1). Thus, a UE may monitor for transmissions in different CORESETgroups and infer that transmissions sent in different CORESET groupscome from different TRPs. There may be other ways in which the notion ofdifferent TRPs may be transparent to the UE.

Example Indication of a Degraded Transmit Beam Group in Group-Based BeamReporting

In certain systems (e.g., per NR Release 15 and 16), a UE can beconfigured to report metrics for transmit (Tx) beams on which it iscapable of simultaneous reception.

For example, as illustrated in FIG. 7, the report may include anindication of such simultaneous receivable Tx beams and correspondinglayer 1 (PHY/L1) metrics per beam, in a group based beam report. Asillustrated, the gNB may configure downlink reference signals (CSI-RS,including SSBs) for the UE to perform beam measurement. Theconfiguration may be done via radio resource control (RRC) signalingconfigurations (CSI-MeasConfig, CSI-ReportConfig, andCSI-ResourceConfig) that indicate what resources to measure and timingcharacteristics of such resources and when to measure and report.

In other words, as illustrated in FIG. 7, the UE may be configured toreport, in a single reporting instance, two different CSI resourceindicator (CRI) or SS/PBCH Resource Block Indicator (SSBRI) indicationsfor each report setting (where CSI-RS and/or SSB resources can bereceived simultaneously by the UE either with a single spatial domainreceive filter (Rx beam), or with multiple simultaneous spatial domainreceive filters (Rx beams).

It is possible that the previously reported group of Tx beams has poorquality for simultaneous reception. For example, due to high cross-beaminterference, or losing a simultaneous reception property (e.g., if 2 Rxbeams for 2 TRPs are on a same UE panel due to UE rotation), the groupof beams previously reported as being suitable for simultaneousreception may degrade. In some cases, the quality may degradesufficiently that the group is no longer suitable for simultaneousreception.

In conventional reporting, such as that described above with referenceto FIG. 7, there is no mechanism to take into account simultaneousreceive problems (e.g., interference and the like). In other words, perthe resource configuration (in REL 15/16), the UE only measures andreports reference signal received power (RSRP) for one resource. Even incases where a (such as Release 16) signal to interference plus noise(SINR) metrics can be used-with an interference measurement resource,typically separate measurements are made, such that an indication ofactual cross-beam interference is not provided. As such, there may notbe sufficient information to determine whether there has beendegradation making a group of beings no longer suitable for simultaneousreception.

Aspects of the present disclosure, however, provide apparatus, methods,processing systems, and computer readable mediums for a UE to detect andto provide the network an indication when the quality of a group ofpreviously-reported simultaneously receivable transmit beams hasdegraded to the point they are no longer simultaneously receivable. WithUE driven reporting for beam management, the UE can proactively indicatethat a previous report is outdated, which can reduce and/or eliminateany request for reports.

FIG. 8 is a flow diagram illustrating example operations 800 forwireless communications, in accordance with certain aspects of thepresent disclosure. The operations 800 may be performed, for example, bya UE (e.g., such as a UE 120 in the wireless communication network 100)for processing transmission scheduled with DCI repetition.

The operations 800 begin, at 802, by reporting, to a network entity,that a group of transmit beams is suitable for simultaneous reception bythe UE.

At 804, the UE determines, after the reporting, that a quality metrichas degraded such that the group of transmit beams is no longer suitablefor simultaneous reception by the UE.

At 806, the UE reports, to the network entity, that the group oftransmit beams is no longer suitable for simultaneous reception.

FIG. 9 is a flow diagram illustrating example operations 900 forwireless communications, in accordance with certain aspects of thepresent disclosure. The operations 1200 may be performed, for example,by a network entity (e.g., such as a BS 110 in the wirelesscommunication network 100) or TRP(s) for scheduling transmissions withDCI repetition.

The operations 900 begin, at 902, by receiving, from a user equipment(UE), reporting that a group of transmit beams is suitable forsimultaneous reception by the UE.

At 904, the network entity receives from the UE, after the reporting, areport that a quality metric has degraded such that the group oftransmit beams is no longer suitable for simultaneous reception by theUE.

In this manner, as illustrated in FIG. 10, for a group of Tx beams thatwas previously reported by a UE as simultaneously receivable, the UE maydetect degradation (due to any of the possible reasons as notedpreviously) and indicate that the group has poor quality forsimultaneous reception.

In some cases, the degraded Tx beam group can be identified by a groupID or beam ID. The group ID may include a TCI codepoint ID, which mapsto transmission configuration indicator (TCI) states of the Tx beams. Insome cases, the group ID may be assigned by the gNB for each reportedbeam group.

The beam ID may be the corresponding TCI state ID or the referencesignal ID transmitted by the Tx beam. In some cases, the UE may reportall beam IDs in an degraded group. In other cases, the UE may reportonly a subset of beam IDs that cannot be received simultaneously.

Depending on a particular implementation or configuration, a UE canreport a degraded Tx beam group autonomously, triggered by an event, orbased on polling by the gNB (e.g., via RRC/MAC-CE).

In case of event-triggered reporting, the gNB may configure the UE withone or more triggering conditions. For example, a gNB may configure a UEto report the group is poor if at least one beam SINR is below athreshold value. In some cases, the gNB may also configure the lists ofgroups that the UE can report.

If polled by the gNB, the UE may monitor for such polling, for example,sometime after receiving the group report/activation or reconfigurationsignal for the group. In some cases, a gNB may send a new polling signalthat precedes an actual scheduled transmission or reception (Tx/Rx)involving the previously reported Tx beam group. In this manner, the gNBmay check the group is still suitable for simultaneous reception beforea transmission.

In some cases, the reported indication of degradation (poor Tx beamgroup) may not necessarily imply that reception from individual beams inthe group is poor. In other words, one or more individual beams maystill be good for individual reception (just not simultaneous Rx).Therefore, in some cases, the UE may include an indicator in the reportthat can inform the gNB whether one or more of the reported beam IDscannot be received simultaneously or cannot be received evenindividually. Such an indicator may be useful, for example, if the groupis reported by all beam IDs in the group.

Example Aspects

Aspect 1: A method for wireless communications by a user equipment (UE),comprising: reporting, to a network entity, that a group of transmitbeams is suitable for simultaneous reception by the UE; determining,after the reporting, that a quality metric has degraded such that thegroup of transmit beams is no longer suitable for simultaneous receptionby the UE; and reporting, to the network entity, that the group oftransmit beams is no longer suitable for simultaneous reception.

Aspect 2: The method of Aspect 1, wherein the determination is based onan evaluation of a cross-beam interference metric.

Aspect 3: The method of Aspect 2, further comprising jointly: measuringa reference signal resource associated with one of the group of transmitbeams; measuring an interference measurement resource transmitted withanother of the group of transmit beams; and calculating the cross-beaminterference metric as a ratio of the reference signal resourcemeasurement and the interference measurement resource measurement.

Aspect 4: The method of any one of Aspects 1-3, wherein the reportidentifies the group of transmit beams by at least one of a group ID orbeam ID of one of the beams in the group.

Aspect 5: The method of Aspect 4, wherein the group ID comprises: atransmission configuration indicator (TCI) codepoint ID, which maps toTCI states of the group of transmit beams; or a group ID assigned by thenetwork entity for the group of transmit beams.

Aspect 6: The method of Aspect 4, wherein the beam ID comprises: acorresponding TCI state ID for one of the transmit beams; or a referencesignal (RS) ID transmitted using the transmit beam.

Aspect 7: The method of Aspect 4, wherein the UE reports all beam IDs ina degraded group of transmit beams no longer suitable for simultaneousreception.

Aspect 8: The method of Aspect 4, wherein the UE reports only a subsetof beam IDs that are no longer suitable for simultaneous reception.

Aspect 9: The method of any one of Aspects 1-8, wherein the UEautonomously reports that the group of transmit beams is no longersuitable for simultaneous reception.

Aspect 10: The method of any one of Aspects 1-9, wherein the UE reportsthat the group of transmit beams is no longer suitable for simultaneousreception when triggered by a condition.

Aspect 11: The method of Aspect 10, wherein the condition is configuredby the network entity and the condition comprises at least one beamsignal to interference plus noise ratio (SINR) being below a thresholdvalue, and the network entity also configures a list of groups oftransmit beams for which the UE can provide reports.

Aspect 12: The method of any one of Aspects 1-11, wherein the UE reportsthat the group of transmit beams is no longer suitable for simultaneousreception when polled by the network entity.

Aspect 13: The method of Aspect 12, wherein the network entity polls theUE via at least one of: a medium access control (MAC) control element(MAC CE) or radio resource control (RRC) signaling.

Aspect 14: The method of any one of Aspects 1-13, wherein the reportingindicates whether individual beams in the group are not suitable forindividual reception.

Aspect 15: A method for wireless communications by a network entity,comprising: receiving, from a user equipment (UE), reporting that agroup of transmit beams is suitable for simultaneous reception by theUE; and receiving from the UE, after the reporting, a report that aquality metric has degraded such that the group of transmit beams is nolonger suitable for simultaneous reception by the UE.

Aspect 16: The method of Aspect 15, wherein the determination is basedon an evaluation of a cross-beam interference metric.

Aspect 17: The method of Aspects 16, further comprising configuring theUE to jointly: measure a reference signal resource associated with oneof the group of transmit beams; measure an interference measurementresource transmitted with another of the group of transmit beams; andcalculate the cross-beam interference metric as a ratio of the referencesignal resource measurement and the interference measurement resourcemeasurement.

Aspect 18: The method of any one of Aspects 15-17, wherein the reportidentifies the group of transmit beams by at least one of a group ID orbeam ID of one of the beams in the group.

Aspect 19: The method of Aspect 18, wherein the group ID comprises: atransmission configuration indicator (TCI) codepoint ID, which maps toTCI states of the group of transmit beams; or a group ID assigned by thenetwork entity for the group of transmit beams.

Aspect 20: The method of Aspect 18, wherein the beam ID comprises: acorresponding TCI state ID for one of the transmit beams; or a referencesignal (RS) ID transmitted using the transmit beam.

Aspect 21: The method of Aspect 18, wherein the UE reports all beam IDsin a degraded group of transmit beams no longer suitable forsimultaneous reception.

Aspect 22: The method of Aspect 18, wherein the UE reports only a subsetof beam IDs that are no longer suitable for simultaneous reception.

Aspect 23: The method of any one of Aspects 15-22, wherein the UEautonomously reports that the group of transmit beams is no longersuitable for simultaneous reception.

Aspect 24: The method of any one of Aspects 15-23, wherein the UEreports that the group of transmit beams is no longer suitable forsimultaneous reception when triggered by a condition.

Aspect 25: The method of Aspect 24, further comprising: configuring theUE for the condition, wherein the condition comprises at least one beamsignal to interference plus noise ratio (SINR) being below a thresholdvalue; and configuring a list of groups of transmit beams for which theUE can provide reports.

Aspect 26: The method of any one of Aspects 15-25, further comprisingpolling the UE to report if the group of transmit beams is no longersuitable for simultaneous reception.

Aspect 27: The method of Aspect 26, wherein the network entity polls theUE via at least one of: a medium access control (MAC) control element(MAC CE) or radio resource control (RRC) signaling.

Aspect 28: The method of any one of Aspects 15-27, wherein the reportingindicates whether individual beams in the group are not suitable forindividual reception.

Aspect 29: An apparatus for wireless communications by a user equipment(UE), comprising: at least one processor and a memory configured to:report, to a network entity, that a group of transmit beams is suitablefor simultaneous reception by the UE; determine, after the reporting,that a quality metric has degraded such that the group of transmit beamsis no longer suitable for simultaneous reception by the UE; and report,to the network entity, that the group of transmit beams is no longersuitable for simultaneous reception.

Aspect 30: An apparatus for wireless communications by a network entity,comprising: at least one processor and a memory configured to: receive,from a user equipment (UE), reporting that a group of transmit beams issuitable for simultaneous reception by the UE; and receive from the UE,after the reporting, a report that a quality metric has degraded suchthat the group of transmit beams is no longer suitable for simultaneousreception by the UE.

The methods disclosed herein comprise one or more steps or actions forachieving the methods. The method steps and/or actions may beinterchanged with one another without departing from the scope of theclaims. In other words, unless a specific order of steps or actions isspecified, the order and/or use of specific steps and/or actions may bemodified without departing from the scope of the claims.

As used herein, a phrase referring to “at least one of” a list of itemsrefers to any combination of those items, including single members. Asan example, “at least one of: a, b, or c” is intended to cover a, b, c,a-b, a-c, b-c, and a-b-c, as well as any combination with multiples ofthe same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b,b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

As used herein, the term “determining” encompasses a wide variety ofactions. For example, “determining” may include calculating, computing,processing, deriving, investigating, looking up (e.g., looking up in atable, a database or another data structure), ascertaining and the like.Also, “determining” may include receiving (e.g., receiving information),accessing (e.g., accessing data in a memory) and the like. Also,“determining” may include resolving, selecting, choosing, establishingand the like.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language of the claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” Unless specifically statedotherwise, the term “some” refers to one or more. All structural andfunctional equivalents to the elements of the various aspects describedthroughout this disclosure that are known or later come to be known tothose of ordinary skill in the art are expressly incorporated herein byreference and are intended to be encompassed by the claims. Moreover,nothing disclosed herein is intended to be dedicated to the publicregardless of whether such disclosure is explicitly recited in theclaims. No claim element is to be construed under the provisions of 35U.S.C. § 112(f) unless the element is expressly recited using the phrase“means for” or, in the case of a method claim, the element is recitedusing the phrase “step for.”

The various operations of methods described above may be performed byany suitable means capable of performing the corresponding functions.The means may include various hardware and/or software component(s)and/or module(s), including, but not limited to a circuit, anapplication specific integrated circuit (ASIC), or processor. Generally,where there are operations illustrated in figures, those operations mayhave corresponding counterpart means-plus-function components withsimilar numbering.

The various illustrative logical blocks, modules and circuits describedin connection with the present disclosure may be implemented orperformed with a general purpose processor, a digital signal processor(DSP), an application specific integrated circuit (ASIC), a fieldprogrammable gate array (FPGA) or other programmable logic device (PLD),discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general-purpose processor may be a microprocessor, but in thealternative, the processor may be any commercially available processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices, e.g., a combinationof a DSP and a microprocessor, a plurality of microprocessors, one ormore microprocessors in conjunction with a DSP core, or any other suchconfiguration.

If implemented in hardware, an example hardware configuration maycomprise a processing system in a wireless node. The processing systemmay be implemented with a bus architecture. The bus may include anynumber of interconnecting buses and bridges depending on the specificapplication of the processing system and the overall design constraints.The bus may link together various circuits including a processor,machine-readable media, and a bus interface. The bus interface may beused to connect a network adapter, among other things, to the processingsystem via the bus. The network adapter may be used to implement thesignal processing functions of the PHY layer. In the case of a userequipment 120 (see FIG. 1), a user interface (e.g., keypad, display,mouse, joystick, etc.) may also be connected to the bus. The bus mayalso link various other circuits such as timing sources, peripherals,voltage regulators, power management circuits, and the like, which arewell known in the art, and therefore, will not be described any further.The processor may be implemented with one or more general-purpose and/orspecial-purpose processors. Examples include microprocessors,microcontrollers, DSP processors, and other circuitry that can executesoftware. Those skilled in the art will recognize how best to implementthe described functionality for the processing system depending on theparticular application and the overall design constraints imposed on theoverall system.

If implemented in software, the functions may be stored or transmittedover as one or more instructions or code on a computer readable medium.Software shall be construed broadly to mean instructions, data, or anycombination thereof, whether referred to as software, firmware,middleware, microcode, hardware description language, or otherwise.Computer-readable media include both computer storage media andcommunication media including any medium that facilitates transfer of acomputer program from one place to another. The processor may beresponsible for managing the bus and general processing, including theexecution of software modules stored on the machine-readable storagemedia. A computer-readable storage medium may be coupled to a processorsuch that the processor can read information from, and write informationto, the storage medium. In the alternative, the storage medium may beintegral to the processor. By way of example, the machine-readable mediamay include a transmission line, a carrier wave modulated by data,and/or a computer readable storage medium with instructions storedthereon separate from the wireless node, all of which may be accessed bythe processor through the bus interface. Alternatively, or in addition,the machine-readable media, or any portion thereof, may be integratedinto the processor, such as the case may be with cache and/or generalregister files. Examples of machine-readable storage media may include,by way of example, RAM (Random Access Memory), flash memory, ROM (ReadOnly Memory), PROM (Programmable Read-Only Memory), EPROM (ErasableProgrammable Read-Only Memory), EEPROM (Electrically ErasableProgrammable Read-Only Memory), registers, magnetic disks, opticaldisks, hard drives, or any other suitable storage medium, or anycombination thereof. The machine-readable media may be embodied in acomputer-program product.

A software module may comprise a single instruction, or manyinstructions, and may be distributed over several different codesegments, among different programs, and across multiple storage media.The computer-readable media may comprise a number of software modules.The software modules include instructions that, when executed by anapparatus such as a processor, cause the processing system to performvarious functions. The software modules may include a transmissionmodule and a receiving module. Each software module may reside in asingle storage device or be distributed across multiple storage devices.By way of example, a software module may be loaded into RAM from a harddrive when a triggering event occurs. During execution of the softwaremodule, the processor may load some of the instructions into cache toincrease access speed. One or more cache lines may then be loaded into ageneral register file for execution by the processor. When referring tothe functionality of a software module below, it will be understood thatsuch functionality is implemented by the processor when executinginstructions from that software module.

Also, any connection is properly termed a computer-readable medium. Forexample, if the software is transmitted from a website, server, or otherremote source using a coaxial cable, fiber optic cable, twisted pair,digital subscriber line (DSL), or wireless technologies such as infrared(IR), radio, and microwave, then the coaxial cable, fiber optic cable,twisted pair, DSL, or wireless technologies such as infrared, radio, andmicrowave are included in the definition of medium. Disk and disc, asused herein, include compact disc (CD), laser disc, optical disc,digital versatile disc (DVD), floppy disk, and Blu-ray® disc where disksusually reproduce data magnetically, while discs reproduce dataoptically with lasers. Thus, in some aspects computer-readable media maycomprise non-transitory computer-readable media (e.g., tangible media).In addition, for other aspects computer-readable media may comprisetransitory computer-readable media (e.g., a signal). Combinations of theabove should also be included within the scope of computer-readablemedia.

Thus, certain aspects may comprise a computer program product forperforming the operations presented herein. For example, such a computerprogram product may comprise a computer-readable medium havinginstructions stored (and/or encoded) thereon, the instructions beingexecutable by one or more processors to perform the operations describedherein. For example, instructions for performing the operationsdescribed herein and illustrated in FIG. 8, and/or FIG. 9.

Further, it should be appreciated that modules and/or other appropriatemeans for performing the methods and techniques described herein can bedownloaded and/or otherwise obtained by a user terminal and/or basestation as applicable. For example, such a device can be coupled to aserver to facilitate the transfer of means for performing the methodsdescribed herein. Alternatively, various methods described herein can beprovided via storage means (e.g., RAM, ROM, a physical storage mediumsuch as a compact disc (CD) or floppy disk, etc.), such that a userterminal and/or base station can obtain the various methods uponcoupling or providing the storage means to the device. Moreover, anyother suitable technique for providing the methods and techniquesdescribed herein to a device can be utilized.

It is to be understood that the claims are not limited to the preciseconfiguration and components illustrated above. Various modifications,changes and variations may be made in the arrangement, operation anddetails of the methods and apparatus described above without departingfrom the scope of the claims.

1. A method for wireless communications by a user equipment (UE),comprising: reporting, to a network entity, that a group of transmitbeams is suitable for simultaneous reception by the UE; determining,after the reporting, that a quality metric has degraded such that thegroup of transmit beams is no longer suitable for simultaneous receptionby the UE; and reporting, to the network entity, that the group oftransmit beams is no longer suitable for simultaneous reception.
 2. Themethod of claim 1, wherein the determination is based on an evaluationof a cross-beam interference metric.
 3. The method of claim 2, furthercomprising jointly: measuring a reference signal resource associatedwith one of the group of transmit beams; measuring an interferencemeasurement resource transmitted with another of the group of transmitbeams; and calculating the cross-beam interference metric as a ratio ofthe reference signal resource measurement and the interferencemeasurement resource measurement.
 4. The method of claim 1, wherein thereport identifies the group of transmit beams by at least one of a groupID or beam ID of one of the beams in the group.
 5. The method of claim4, wherein the group ID comprises: a transmission configurationindicator (TCI) codepoint ID, which maps to TCI states of the group oftransmit beams; or a group ID assigned by the network entity for thegroup of transmit beams.
 6. The method of claim 4, wherein the beam IDcomprises: a corresponding TCI state ID for one of the transmit beams;or a reference signal (RS) ID transmitted using the transmit beam. 7.The method of claim 4, wherein the UE reports all beam IDs in a degradedgroup of transmit beams no longer suitable for simultaneous reception.8. The method of claim 4, wherein the UE reports only a subset of beamIDs that are no longer suitable for simultaneous reception.
 9. Themethod of claim 1, wherein the UE autonomously reports that the group oftransmit beams is no longer suitable for simultaneous reception.
 10. Themethod of claim 1, wherein the UE reports that the group of transmitbeams is no longer suitable for simultaneous reception when triggered bya condition.
 11. The method of claim 10, wherein the condition isconfigured by the network entity and the condition comprises at leastone beam signal to interference plus noise ratio (SINR) being below athreshold value, and the network entity also configures a list of groupsof transmit beams for which the UE can provide reports.
 12. The methodof claim 1, wherein the UE reports that the group of transmit beams isno longer suitable for simultaneous reception when polled by the networkentity.
 13. The method of claim 12, wherein the network entity polls theUE via at least one of: a medium access control (MAC) control element(MAC CE) or radio resource control (RRC) signaling.
 14. The method ofclaim 1, wherein the reporting indicates whether individual beams in thegroup are not suitable for individual reception.
 15. A method forwireless communications by a network entity, comprising: receiving, froma user equipment (UE), reporting that a group of transmit beams issuitable for simultaneous reception by the UE; and receiving from theUE, after the reporting, a report that a quality metric has degradedsuch that the group of transmit beams is no longer suitable forsimultaneous reception by the UE.
 16. The method of claim 15, whereinthe determination is based on an evaluation of a cross-beam interferencemetric.
 17. The method of claim 16, further comprising configuring theUE to jointly: measure a reference signal resource associated with oneof the group of transmit beams; measure an interference measurementresource transmitted with another of the group of transmit beams; andcalculate the cross-beam interference metric as a ratio of the referencesignal resource measurement and the interference measurement resourcemeasurement.
 18. The method of claim 15, wherein the report identifiesthe group of transmit beams by at least one of a group ID or beam ID ofone of the beams in the group.
 19. The method of claim 18, wherein thegroup ID comprises: a transmission configuration indicator (TCI)codepoint ID, which maps to TCI states of the group of transmit beams;or a group ID assigned by the network entity for the group of transmitbeams.
 20. The method of claim 18, wherein the beam ID comprises: acorresponding TCI state ID for one of the transmit beams; or a referencesignal (RS) ID transmitted using the transmit beam.
 21. The method ofclaim 18, wherein the UE reports all beam IDs in a degraded group oftransmit beams no longer suitable for simultaneous reception.
 22. Themethod of claim 18, wherein the UE reports only a subset of beam IDsthat are no longer suitable for simultaneous reception.
 23. The methodof claim 15, wherein the UE autonomously reports that the group oftransmit beams is no longer suitable for simultaneous reception.
 24. Themethod of claim 15, wherein the UE reports that the group of transmitbeams is no longer suitable for simultaneous reception when triggered bya condition.
 25. The method of claim 24, further comprising: configuringthe UE for the condition, wherein the condition comprises at least onebeam signal to interference plus noise ratio (SINR) being below athreshold value; and configuring a list of groups of transmit beams forwhich the UE can provide reports.
 26. The method of claim 15, furthercomprising polling the UE to report if the group of transmit beams is nolonger suitable for simultaneous reception.
 27. The method of claim 26,wherein the network entity polls the UE via at least one of: a mediumaccess control (MAC) control element (MAC CE) or radio resource control(RRC) signaling.
 28. The method of claim 15, wherein the reportingindicates whether individual beams in the group are not suitable forindividual reception.
 29. An apparatus for wireless communications by auser equipment (UE), comprising: at least one processor and a memoryconfigured to: report, to a network entity, that a group of transmitbeams is suitable for simultaneous reception by the UE; determine, afterthe reporting, that a quality metric has degraded such that the group oftransmit beams is no longer suitable for simultaneous reception by theUE; and report, to the network entity, that the group of transmit beamsis no longer suitable for simultaneous reception.
 30. An apparatus forwireless communications by a network entity, comprising: at least oneprocessor and a memory configured to: receive, from a user equipment(UE), reporting that a group of transmit beams is suitable forsimultaneous reception by the UE; and receive from the UE, after thereporting, a report that a quality metric has degraded such that thegroup of transmit beams is no longer suitable for simultaneous receptionby the UE.